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04-22-2009, 11:34 PM #1
Removing tooling marks from aluminum for anodizing?
I have machined some aluminum parts which will get hard coat anodized. I would like to remove the tooling marks first and get a nice uniform surface. I don't have access to a tumbler, not sure that would do it anyway. Could I have them bead blasted first? Will that be sufficient to remove/blend the tooling marks? Is there a better way?
04-22-2009, 11:46 PM #2
How noticeable are the tooling marks? Are there any critical dimensions? You can have the plater do a heavy etch before anodize if there aren’t. Or yes, bead blast with light media. How many parts?
04-22-2009, 11:55 PM #3
Ask your Plater if he has a flat belt or timesaver..Or if they are too small for that..yes a tumbler will remove the normal tool marks..
Your plater will probably Know someone with a tumbler or might even have his own..some do..some don't..
04-23-2009, 03:53 AM #4
If the machining texture runs too deep for that I'd try glass bead
04-23-2009, 07:45 AM #5
If it's only a few parts you can use scotchbrite along with soapy water to smooth them up. Of course, if it is a production lot this is not feasible, but around here we send out small lots of parts for a project and they all get scrubbed to a satin finish first. Its a bit of elbow grease, but well worth it, as the finished product is very nice.
04-23-2009, 10:14 AM #6
A 10 inch long piece of hardwood dowel with a slot an inch or so from the end, stuff some steel wool in the slot then wind it around the dowel nice and tight, spinn it in a drillpress fast as it will go and it will conform to almost any profile and remove those cutter lines, I wouldn't want to do a bunch of them that way. We have ours sticking out of a downdraft table. We started out with them in drill presses, it is good in that you can achieve a light grain in one direction and it looks nice after annodize.
04-23-2009, 11:47 AM #7
Thanks for the suggestions. It is only a couple of pieces, but a lot of contours so a belt or spindle would not reach a lot of it. I could wet sand them lightly but that always seems to leave its own marks. I will try the scotchbrite and soupy water - haven't tried that one yet.
04-23-2009, 12:50 PM #8
A stiff mix of 409 cleaner and water, used HOT will etch and clean Alu like nobody's business.
That ans a bit of scotchbright will smooth smaller tool marks